Monkeys can learn under human instructions, because monkeys belong to primates and similar species like humans, so they can learn under certain conditions. For example, chimpanzees can learn some sign language under the guidance of human beings, expressing much more content than most animals, but it is extremely difficult for them to create their own words or word combinations to express new concepts. Moreover, there are practical examples, such as elephants in circuses can draw pictures, and dolphins in aquariums can understand simple human characters, but their brains are not big, and there are not many things they can remember. It takes a long time of uninterrupted teaching to learn and present the most perfect effect.